Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d85838ab3c8ded…

MALICIOUS

PDF

81.1 KB Created: 2021-03-29 15:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 208f5a2e6f466ae68baaf6d237788f5d SHA-1: 8483b2264b0bd2b44cc2d51da8cc88e9a1964115 SHA-256: f8d85838ab3c8dedd6ad4d52fc79bc645964c934104ae997885e1d191b21c141
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, https://maypoin.ru/award?keyword=convert+base64+to+pdf+in+angular+7, appears to be a lure for users searching for specific technical information. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/award?keyword=convert+base64+to+pdf+in+angular+7 PDF link annotation
    • https://cdn.sqhk.co/parikozug/gifhsyY/suzalukudalelurorid.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/iafjhda/parkour_race_freerun_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/Hxhffje/nalebiv.pdfIn PDF document text
    • https://cdn.sqhk.co/sazipuvaxiv/gcHaRSC/that_s_life_mac_miller_sia.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/wowifapirusonivezawemulu.pdfIn PDF document text
    • https://cdn.sqhk.co/jegetito/hdLibo4/levameda.pdfIn PDF document text
    • http://gafegenuwegapok.iblogger.org/rurarefewaxavuki.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/hiaVptA/rise_of_steel_v2_0_mod_apk_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zupenafud/riduttori_epicicloidali_bonfiglioli_catalogo.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_8e3ebb01f80c466fbcedaef946732b61.pdf?index=trueIn PDF document text
    • http://gixopesibesuges.epizy.com/leripuxirakimexakis.pdfIn PDF document text
    • http://baduvebeketuwo.epizy.com/takumejowolalal.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/makaxarofezubilase.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_b1c84a6cec8b41de9ad4679cbdc00dc6.pdf?index=trueIn PDF document text
    • http://durenifujogax.myartsonline.com/types_of_mental_disorders.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_91702f3cfea94d3d9d05eb16572c1188.pdf?index=trueIn PDF document text
    • http://vavubal.epizy.com/air_force_academy_stadium_series_parking.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/selezezexuziwoxupoja.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_cc6067c285ac4745a3181804285c314a.pdf?index=trueIn PDF document text
    • http://modotiwavuw.epizy.com/gilozova.pdfIn PDF document text
    • http://xarilupinedup.myartsonline.com/atomic_absorption_spectrophotometer_principle.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 5636 bytes
SHA-256: 51c1ae075d34c798f85a41ba19b9dac887a8e9b75382bd19f65a977813655f07
font_01_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 11748 bytes
SHA-256: 85a3d3b46b3f0b796a72c878105d56dfd55e1701beaac2a59b375fe8a689e71b
font_02_sfnt_off00012002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61